Thinktank’s influential pre-budget report urges key decisions to be made now and not put off until next year

John Healey has been warned by Britain’s leading tax and spending experts that his budget risks being a “work of fiction” unless he sets out plans to cover £35bn in spending pressures.

As the war in the Middle East rattles the public finances, the Institute for Fiscal Studies (IFS) said the damage from higher inflation meant the chancellor would need to either top up funds for his current government spending plans or impose deep real-terms cuts by the end of the decade.